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import { experimentOn } from '@islavi/ng2-component-lab';
const basicContext = {
scrollContainerId: 'scrollContainer',
numLines: Array(20).fill(null),
hitBottomCount: 0,
pageCount: 0,
isPageLoading: false,
insertPageImmediately: function(pageNum) {
const scrollContainerElem: HTMLElement = document.getElementById(this.scrollContainerId);
scrollContainerElem.appendChild(document.createElement('hr'));
Array(10).fill(null).forEach((_, i) => {
const lineElem = document.createElement('div');
lineElem.innerHTML = `Page ${pageNum} - line ${i + 1}`;
scrollContainerElem.appendChild(lineElem);
});
},
loadPageAsync: function(pageNum, timeout) {
return new Promise((resolve) => {
setTimeout(() => {
this.insertPageImmediately(pageNum);
resolve();
}, timeout);
});
},
onScrollHitBottom: function() {
this.hitBottomCount++;
}
};
const basicStyle = `
.scroll-container {
margin: 12px;
border: none;
padding: 5px;
width: 200px;
height: 100px;
overflow: auto;
font-size: 20px !important;
box-shadow: #666 1px 1px 10px;
}
.example-source {
background: #eeeeee;
padding: 10px;
border: 1px solid #999999;
}
.example-source pre {
overflow: hidden;
background: #dddddd;
margin-top: 5px;
padding: 5px;
user-select: text;
}
`;
const makeBasicStyleDistance = (distance: number) => `
.scroll-container::after {
display: block;
content: '';
height: ${distance}px;
background: red;
}
`;
export default experimentOn('Infinite-Scroll')
.group("Infinite Scroll",[
{
id: 'infiniteScrollUsage',
showSource: true,
context: Object.assign({}, basicContext),
title: 'Infinite scroll usage',
description: 'Infinite scroll usage',
styles: [basicStyle],
template: `
<div (infiniteScroll)="onScrollHitBottom()" class="scroll-container">
<div *ngFor="let _i of numLines; let i=index">
Line {{i + 1}}
</div>
</div>
Hit bottom for <b>{{hitBottomCount}}</b> times!
<div class="example-source">
<b>onScrollHitBottom declaration:</b>
<pre>{{onScrollHitBottom}}</pre>
</div>
`
},
{
id: 'infiniteScrollUsageWithDistance',
showSource: true,
title: 'Infinite scroll usage with distance',
context: Object.assign({}, basicContext),
styles: [basicStyle, makeBasicStyleDistance(50)],
description: '',
template: `
<div (infiniteScroll)="onScrollHitBottom()" [infiniteScrollDistance]="50" class="scroll-container">
<div *ngFor="let _i of numLines; let i=index">
Line {{i + 1}}
</div>
</div>
Hit bottom for <b>{{hitBottomCount}}</b> times!
<div class="example-source">
<b>onScrollHitBottom declaration:</b>
<pre>{{onScrollHitBottom}}</pre>
</div>
`
},
{
id: 'infiniteScrollUsageWithExpandingContent',
title: 'Infinite scroll usage with expanding content',
showSource: true,
context: Object.assign({}, basicContext, {
scrollContainerId: 'scrollContainer1',
onScrollHitBottom: function() {
this.hitBottomCount++;
this.insertPageImmediately(this.pageCount + 1);
this.pageCount++;
}
}),
styles: [basicStyle, makeBasicStyleDistance(20)],
template: `
<div (infiniteScroll)="onScrollHitBottom()" [infiniteScrollDistance]="20" class="scroll-container" id="{{scrollContainerId}}">
<div *ngFor="let _i of numLines; let i=index">
Line {{i + 1}}
</div>
</div>
Hit bottom for <b>{{hitBottomCount}}</b> times!<br/>
Loaded {{pageCount}} pages!
<div class="example-source">
<b>onScrollHitBottom declaration:</b>
<pre>{{onScrollHitBottom}}</pre>
</div>
`
},
{
id: 'infiniteScrollUsageWithExpandingContentAsynchronous',
title: 'Infinite scroll usage with expanding content asynchronous',
showSource: true,
context: Object.assign({}, basicContext, {
scrollContainerId: 'scrollContainer2',
onScrollHitBottom: function() {
this.hitBottomCount++;
if (!this.isPageLoading) {
this.isPageLoading = true;
this.loadPageAsync(this.pageCount + 1, 5000).then(() => {
this.pageCount++;
this.isPageLoading = false;
});
}
}
}),
styles: [basicStyle, makeBasicStyleDistance(20)],
template: `
<div (infiniteScroll)="onScrollHitBottom()" [infiniteScrollDistance]="20" class="scroll-container" id="{{scrollContainerId}}">
<div *ngFor="let _i of numLines; let i=index">
Line {{i + 1}}
</div>
</div>
Hit bottom for <b>{{hitBottomCount}}</b> times!<br/>
Loaded {{pageCount}} pages! <span *ngIf="isPageLoading">LOADING page #{{this.pageCount + 1}} ...</span>
<div class="example-source">
<b>onScrollHitBottom declaration:</b>
<pre>{{onScrollHitBottom}}</pre>
</div>
`
}
]);
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